When wound and start/stop slide moved to the right, the bird emerges through richly gilded pierced and chased gilt grille, moving bone beak, wings and body from side-to-side to highly unusual staccato continuous birdsong.

We know when antique bird boxes need adjustment if the sound is poor or cyphering, but this one sounded very different from the start. The notation cam has been milled at 45-degrees with the toe of the reading rod also cut to the same angle. This creates a larger surface area and so all peaks and dips which are milled for the notation are picked up much quicker. The peaks on this cam are very tapered and so each note is transcribed quicker than a box with the usual cam angle cuts.

What you hear is a very melodic and precise birdsong which deserves careful listening.